How to share routing data in nodejs

With the popularity of Node.js, more and more programmers choose to use Node.js to develop web applications. During the development process, it is often necessary to share routing data to make the application more efficient.

Node.js provides a very convenient way to share routing data using global objects. In this article, we will introduce how to use global objects to share routing data.

1. What is a global object

In Node.js, the global object is a global object that is accessible in all modules. The global object can share data between all modules. When we need to share data between different modules, we can use global objects.

2. Sharing data in routing

In Node.js, routing refers to the mechanism that maps URL requests to corresponding handlers. In the route handler, we can access the global object and use it to share data.

Here is an example for handling routing:

// index.js

var express = require('express');
var app = express ();

app.get('/users/:id', function(req, res) {

// 在这里设置全局变量
global.userid = req.params.id;

});

app.listen(3000) ;

In the above code, we define a route handler. When the request contains "/users/:id", we store the ID value in the request into the global object. This ID value can be used in other modules.

Now we have a data saved in the global object that we can access in other route handlers. Here is an example of using global variables:

// user.js

var express = require('express');
var app = express();

app.get('/profile', function(req, res) {

// 在这里获取全局变量
var userid = global.userid;
res.send('User ID: ' + userid);

});

Now we have used the global object to share routing data. When we set a global variable in one route handler, it is available in other route handlers.

3. Notes

Using global objects to share data is a very convenient method, but there are also some issues that need to be paid attention to. In large applications, the number of global variables can grow quickly. This can make the code difficult to maintain and extend. Therefore, we should avoid using global variables as much as possible.

In addition, when global variables are shared between multiple modules, naming conflicts may occur. To avoid this problem, we should use local variables whenever possible.

Finally, we need to note that global variables are stored in memory and will affect the performance of the application. If we need to share large amounts of data, it is better to use other methods, such as using a database or caching system.

4. Conclusion

Node.js provides a convenient way to share route data using global objects. We can share route data by setting global variables in route handlers and accessing them in other modules. It should be noted that there should not be too many global variables, as it will affect the maintainability and performance of the code.

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